Good question, and I have the answer! Chrysler Co., as many of you know used many parts on many cars and trucks for many years that are the same item. On the 1993 W250 I just recently completed, I had to replace this system. Chrysler has the kit, it's available, just look for it at the dealers. It's a complete rebuild kit, new rubber, new clip/cap, new U-joint inner guts, and pin. The clip/cap is only good for maybe 2 uses then it has to be tossed for a new one.
Here's a pic of this recently completed install on the said truck. Oops! I lied! I should have taken a pic, but, didn't! Sorry!